Update test framework: fix run_tests.py to support all test files, add auto-import-check for test files

node_modules/import-in-the-middle/test/low-level/dynamic-import-default.js

@@ -0,0 +1,23 @@
+// Unless explicitly stated otherwise all files in this repository are licensed under the Apache 2.0 License.
+//
+// This product includes software developed at Datadog (https://www.datadoghq.com/). Copyright 2021 Datadog, Inc.
+
+const { addHook } = require('../../index.js')
+const { strictEqual } = require('assert')
+
+addHook((name, exports) => {
+  if (name.match(/something\.m?js/)) {
+    const orig = exports.default
+    exports.default = function bar () {
+      return orig() + 15
+    }
+  }
+})
+
+;(async () => {
+  const { default: barMjs } = await import('../fixtures/something.mjs')
+  const { default: barJs } = await import('../fixtures/something.js')
+
+  strictEqual(barMjs(), 57)
+  strictEqual(barJs(), 57)
+})()